Standardized centrifugal pump FBCN Series

The FBCN technical manual (MTEC-03/00) specifies the series for clean or turbid liquids in the chemical, petrochemical, pulp and paper, steel, mining, food, textile and pharmaceutical industries and in sanitation. For fluids with suspended solids, the manual asks for FB to be consulted before selection, because the seal chamber arrangement changes with the kind of solid: S2 for particles or fibers and S3 for abrasives or fluids that tend to crystallize.

According to the FBCN manual, the back pull-out construction lets the bearing assembly be withdrawn from the volute without disconnecting or misaligning the pumping pipework, which the manual credits for easier assembly, disassembly and maintenance. With a spacer coupling, which the manual lists among the accessories, the motor can also stay on the baseplate during removal.

The FBCN manual gives these series maximums: flow up to 2,200 m³/h, head up to 135 m, sizes from DN 25 to DN 300 and speed up to 3,500 rpm. They are limits across the range of models and do not occur together in a single pump: each model has its own operating field in the manual's quick selection table and curves. Above 135 m, the FB Bombas option is the FBME, a horizontal multistage centrifugal pump from DN 80 to DN 150, with maximums of 400 m³/h and 300 m per manual MTEC-08/01, which are not simultaneous either.

The FBCN manual gives temperatures up to 260 °C. In Table 1, with packing, the range is −50 to 105 °C without a cooling chamber and up to 350 °C with a cooling chamber, in sizes 25-150 to 150-315 (100-500 included); from 150-400 upward, the table gives no value with a cooling chamber. With a mechanical seal, the table refers to the manufacturer's recommendation. The seal chamber arrangements have their own limits in section 10 of the manual: the standard ST arrangement, lubricated by the pumped fluid itself, goes up to 160 °C; S1, S2 and S3, with liquid from an external source, go up to 105 °C and cannot use a cooling chamber; S4, for thermal oil, with graphite packing, is the arrangement for temperatures above 260 °C. Allowable pressure falls as temperature rises: the maximum discharge pressure curves run from −30 to 160 °C for the cast iron casing and from −50 to 260 °C for the A216 WCB carbon steel and A743 CF8M stainless steel casing, and the manual has charts for each flange class.

The FBCN manual (MTEC-03/00) lists 54 sizes in Table 1: 43 with dimensions in Table 7 and 11 with dimensions on request (the 100-500 and the 10 large-capacity models, 150-500 to 300-340). It states back pull-out construction and mechanical construction per ASME B73.1. Series maximums: 2,200 m³/h, 135 m and 3,500 rpm. Temperature: up to 260 °C in the operating data; in Table 1, with packing, −50 to 105 °C without a cooling chamber and up to 350 °C with a cooling chamber in sizes 25-150 to 150-315 (100-500 included). The maximum discharge pressure curves (Figures 1 and 2) run from −30 to 160 °C for the cast iron casing and from −50 to 260 °C for carbon steel and stainless steel. Each model has its own limits in the table. The designation gives the nominal diameter of the discharge flange and the nominal impeller diameter, in millimeters: the FBCN 150-400 has a DN 150 discharge and a 400 mm nominal impeller.

Yes. In FB Bombas' FBFS fire pump sets, the main pump, electric or diesel driven, is an FBCN sized for the flow and pressure of the project. The set is designed per NFPA 20 or ABNT NBR 16704 when the specification requires it; this is a design declaration by FB, and a product certification is proven only by the certificate issued by the certification body. ABNT NBR 10897 (automatic sprinklers) and NBR 13714 (hydrants and hose reels) govern the system, which is sized by the fire protection design.

The FBCN manual does not tie materials to industries: the choice follows the fluid, the temperature and the pressure. The casing can be cast iron, ASTM A216 WCB carbon steel or ASTM A743 CF8M stainless steel, each with its own maximum discharge pressure × temperature chart; the flange table also covers ductile iron. For clean water, the limit to check is the chart of the chosen casing; for a corrosive fluid, the compatibility of the material with the stated concentration and temperature is checked during selection.

To replace an installed centrifugal pump, FB Bombas supplies the complete FBCN pump and checks, model by model, the dimensions in manual MTEC-03/00 (baseplate, nozzles, flanges and shaft) and the duty point before the order. The manual states mechanical construction per ASME B73.1; dimensional interchangeability with the existing pump is not assumed and is confirmed on the drawing. That is because ASME B73.1 provides for direct exchange between pumps with the same dimension designation of the standard, and the FBCN uses its own designation, made of the discharge DN and the nominal impeller diameter.

Only when the dimensions match. Engineering compares Table 7 of manual MTEC-03/00 — DN1 and DN2 nozzles, height and length dimensions, foot dimensions and bolt holes, and shaft end, in millimeters — with the drawing or site survey of the current pump. If they match, baseplate, piping and foundation stay as they are; if not, the difference is handled in the design of the set, and the manual lists a welded structural-steel baseplate among the supplied accessories. The duty point and the available NPSH are checked in every case.

Six items close the analysis: flow (Q, in m³/h) and head (H, in m) at the duty point; NPSH available at the installation; temperature and nature of the fluid, including suspended solids; flange class and facing; and the identification of the current pump, read from its nameplate, with its dimensional drawing or dimensions measured on site. With these, application engineering confirms which of the 54 models in the FBCN manual fits, whether the baseplate can be kept and which materials and sealing arrangement apply.

Yes, within the scope of the manual: clean or turbid liquids. That covers clean process and utility water and sanitation, which the manual lists among its applications. For effluent with solid particles or fibers in suspension, the manual provides the S2 seal chamber, with lubrication and sealing by external liquid, and, for abrasive particles or a tendency to crystallize, S3 flushing; in these cases FB is consulted before selection. Selection is made by duty point and available NPSH, among the 54 models of the series.

The FBCN manual provides casings in cast iron, ASTM A216 WCB carbon steel or ASTM A743 CF8M stainless steel, and flanges in cast iron (ANSI B16.1, 125 or 250 lb FF) or in steels and ductile iron (ANSI B16.5/B16.42, 150 lb RF). For the impeller, it sets the maximum peripheral speed by material: cast iron up to 40 m/s, ductile iron and carbon steel up to 60 m/s and stainless steels up to 80 m/s, which limits the speed of each combination. A stainless impeller with a passage width of up to 15 mm has the curve efficiency reduced by 2 to 3 points (Table 4). Material is chosen by fluid, temperature and pressure, not by model.

ASME B73.1, not API 610. The FBCN technical manual (MTEC-03/00) states mechanical construction per ASME B73.1 (Specification for Horizontal End Suction Centrifugal Pumps for Chemical Process), the standard for horizontal, end suction, single stage, centerline discharge pumps for chemical process, with dimensional interchangeability requirements between pumps of the same designation. API 610 (Centrifugal Pumps for Petroleum, Petrochemical and Natural Gas Industries), from the American Petroleum Institute, sets requirements for the design, materials, manufacturing, testing and performance of centrifugal pumps for process services in the petroleum, petrochemical and gas industries, and covers several construction types. When a refining, oil or gas project requires API 610, FB Bombas handles the supply as an engineered-to-order solution, with design compliance defined in the proposal.

The FBCN technical manual (MTEC-03/00) states that the pump is mechanically compliant with ASME B73.1 and gives the hydrostatic test pressure "per ANSI B 73.1", as the manual refers to the same standard. Flanges are cast iron per ANSI B16.1 (125 or 250 lb FF) or steels and ductile iron per ANSI B16.5/B16.42 (150 lb RF), and the parts list follows DIN EN 24250 numbering. The dimensions of each model are in the manual's own dimension table, and interchangeability with an installed pump is confirmed on the drawing. ASME publishes the standard; it does not certify pumps.

The FBCN manual does not state compliance with EN 733, the European standard that replaced DIN 24255. The FBCN designation (discharge DN and nominal impeller diameter, such as 150-400) and the dimensions of each model are in the tables of manual MTEC-03/00. To replace an installed EN 733 pump, engineering compares the drawings dimension by dimension before recommending a model.

FB Bombas reports a registration in the Petrobras supplier registry. Petrobras issues the Certificado de Registro Cadastral (CRC), which replaces the former CRCC, to suppliers that meet one or more criteria of the supply family of interest; it is a supplier registration, not a product certification. Validity and supply families must be checked on the current certificate, provided on request. The legal name is Fabricadora de Bombas Indústria e Comércio Ltda., CNPJ 61.381.240/0001-78, which can be looked up at the Brazilian Federal Revenue Service (Receita Federal).

Delivery time and availability are given in the quotation, because they depend on the model among the 54, the materials, the sealing arrangement, the driver and the tests requested. The FBCN is machined and assembled at the FB Bombas factory in Cabreúva-SP, which has a hydraulic test bench; the tests for each supply are defined in the proposal.

The quotation is requested through the sales form, WhatsApp or the sales e-mail, with flow (Q, in m³/h), head (H, in m), available NPSH, fluid and temperature, presence of solids, flange class and desired materials. The FBCN technical manual (MTEC-03/00), with selection table, curves, pressure × temperature charts, sealing arrangements and dimension table, is at /en/technical-manuals/fbcn. The manual page is available in Portuguese, English and Spanish; the PDF is in Portuguese.

The FBCN manual (MTEC-03/00) cites ASME B73.1 for mechanical construction and the same standard, as ANSI B 73.1, for the hydrostatic test pressure; ANSI B16.1 for cast iron flanges (125 or 250 lb FF) and ANSI B16.5/B16.42 for steel and ductile iron flanges (150 lb RF), with allowable pressure × temperature charts per class; DIN EN 24250 for part numbering; and NPT threads on the auxiliary connections. The dimensions of each model are in the manual's own dimension table, available at /en/technical-manuals/fbcn.